node/test/simple/test-readline-interface.js

// Copyright Joyent, Inc. and other Node contributors.
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//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var assert = require('assert');
var readline = require('readline');
var EventEmitter = require('events').EventEmitter;
var inherits = require('util').inherits;

function FakeInput() {
  EventEmitter.call(this);
}
inherits(FakeInput, EventEmitter);
FakeInput.prototype.resume = function() {};
FakeInput.prototype.pause = function() {};

var fi;
var rli;
var called;

// sending a full line
fi = new FakeInput();
rli = new readline.Interface(fi, {});
called = false;
rli.on('line', function(line) {
  called = true;
  assert.equal(line, 'asdf\n');
});
fi.emit('data', 'asdf\n');
assert.ok(called);

// sending a blank line
fi = new FakeInput();
rli = new readline.Interface(fi, {});
called = false;
rli.on('line', function(line) {
  called = true;
  assert.equal(line, '\n');
});
fi.emit('data', '\n');
assert.ok(called);

// sending a single character with no newline
fi = new FakeInput();
rli = new readline.Interface(fi, {});
called = false;
rli.on('line', function(line) {
  called = true;
});
fi.emit('data', 'a');
assert.ok(!called);
rli.close();

// sending a single character with no newline and then a newline
fi = new FakeInput();
rli = new readline.Interface(fi, {});
called = false;
rli.on('line', function(line) {
  called = true;
  assert.equal(line, 'a\n');
});
fi.emit('data', 'a');
assert.ok(!called);
fi.emit('data', '\n');
assert.ok(called);
rli.close();

// sending multiple newlines at once
fi = new FakeInput();
rli = new readline.Interface(fi, {});
var expectedLines = ['foo\n', 'bar\n', 'baz\n'];
var callCount = 0;
rli.on('line', function(line) {
  assert.equal(line, expectedLines[callCount]);
  callCount++;
});
fi.emit('data', expectedLines.join(''));
assert.equal(callCount, expectedLines.length);
rli.close();

// sending multiple newlines at once that does not end with a new line
fi = new FakeInput();
rli = new readline.Interface(fi, {});
var expectedLines = ['foo\n', 'bar\n', 'baz\n', 'bat'];
var callCount = 0;
rli.on('line', function(line) {
  assert.equal(line, expectedLines[callCount]);
  callCount++;
});
fi.emit('data', expectedLines.join(''));
assert.equal(callCount, expectedLines.length - 1);
rli.close();

// sending a multi-byte utf8 char over multiple writes
var buf = Buffer('☮', 'utf8');
fi = new FakeInput();
rli = new readline.Interface(fi, {});
callCount = 0;
rli.on('line', function(line) {
  callCount++;
  assert.equal(line, buf.toString('utf8') + '\n');
});
[].forEach.call(buf, function(i) {
  fi.emit('data', Buffer([i]));
});
assert.equal(callCount, 0);
fi.emit('data', '\n');
assert.equal(callCount, 1);
rli.close();

assert.deepEqual(fi.listeners('end'), []);
assert.deepEqual(fi.listeners('data'), []);